how does a 4 stroke engine work?

Answer 1

if you type your question into yahoo search or any other search engine you will get all the info you want

Answer 2

Let's begin with the starter...

The starter energizes with the turn of the ignitiion key rotating the engine's crankshaft that has all the pistons attached to it. Connected to the crankshaft is a timing belt that turns the camshafts in time with the crankshaft. The cams open and close intake and exhaust valves at the top of the engine above each cylinder.

While the engine is rotating with the starter, one piston will travel down the cylinder while the intake valves are open drawing in the air/fuel mixture. THAT is stroke number 1, the intake stroke.

When that piston starts coming back up, the intake valve will have closed and the piston then compresses the air/fuel mixture. This is stroke number 2, the compression stroke.

When the air/fuel mixture is adequately compressed, the spark plug fires and ignites the air/fuel mixture. The combustion of this mixture, and it's resulting expansion of gasses, forces the piston back down with high force. This is stroke number 3, the power stroke.

When the piston starts coming back up, the exhaust valve will have opened and the piston forces the spent combustion gasses out of the engine. This is stroke number 4, the exhaust stroke.

Multiply this action by the number of pistons and you get your four, six, eight, ten, or even 12 cylinder engines. All only get their power from the power stroke. Generally, the more power strokes you have, the more powerful your engine but also the more fuel it will use. The more cylinders you have, the smoother the engine can be made to run.

Of course, there are many more details to each system, i.e. the intake system has an air cleaner, throttle body or carburetor... the exhaust system has a catalytic converter, muffler, resonator etc.

All interesting stuff and a complete waste of our natural resources all contributing to pollution of various types while desecrating the countryside with asphalt roads all in the name of moving our lazy butts around and satisfying our need for speed and gratification!

Answer 3

As the piston moves up and down the cylinder it is called a stroke. A four stroke engine strokes four times between ignition strokes. This is how it works. the first stroke is a compression stroke, on this stroke the valves are closed and the air in the chamber is compressed until the piston is almost to top dead center and then the spark plug ignites creating an explosion that drives the piston back down, This is the second stroke. On the third stroke the piston is moving back up and the exhaust valve is open forcing the exhaust and heat out. The fourth stroke is when the piston is moving down again this time with the intake valve open, this is when the new air and fuel is drawn into the combustion chamber and the whole cycle starts over. Hope I have been helpful.

Answer 4

with gasoline&compression